Shop OBEX P1 Docs P2 Docs Learn Events
High-side switch? — Parallax Forums

High-side switch?

mparkmpark Posts: 1,305
edited 2010-11-28 18:24 in General Discussion
I have four large 7-segment LED displays that I intend to hook up to a Prop. Each segment has four LEDs in series. The anodes are common.

Previously I've done this with a bunch of transistors and resistors, but I'm sure there's a cleaner way. I'm thinking ULN2803 for the low side, but is there a chip for switching the high side (about 12V, maybe 300mA max in bursts)?
highside.PNG
957 x 545 - 18K

Comments

  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2010-11-25 01:01
    VN330SPTR-32-E

    'Not through-hole, though, and a bit on the high-side, price-wise, too.

    -Phil
  • kwinnkwinn Posts: 8,697
    edited 2010-11-25 07:21
    Take a look at the UDN2981/2. As close to a high side version of the ULN2803 as I have been able to find. Available in smt and thru hole.
  • kwinnkwinn Posts: 8,697
    edited 2010-11-25 07:51
    PS - You might even consider using a quad optoisolator like the PS2502-4 or even a quad triac output optoisolator like the TLP525G-4.
  • mparkmpark Posts: 1,305
    edited 2010-11-28 18:24
    Thanks, gents. The VN330-etc looks perfect but is too rich for my blood, so I ordered some UDN2891s even though I'll only use half of the chip's drivers.
Sign In or Register to comment.